Why am I receiving "Failed Delivery Notifications" for emails I never sent?

What is most likely happening is that you are being "Joe-Jobbed".  A  joe job is where a spammer sends out spam and makes it look like the 'From' or 'Reply-to' address is one of your email addresses.  A quick check on the receiving side will show that the email did not actually come from you so any proper spam blacklist should never report your email address as a source of spam because of a Joe-Job.

There is no 100% guaranteed way at the moment to stop from being Joe-Jobbed however there are ways you can protect yourself from it.

## You can ask us (or whomever has your domain in their nameservers) to set up an "SPF" record.  This basically tells any mailserver that is receiving email from your domain which mailservers are allowed to send email from your domain.  i.e. this would typically be mail.*yourdomain*.*com* if your domain is hosted with us, and perhaps your Internet Service Provider's mailserver also (e.g. mail1.eircom.net)

## Avoid publishing your email address in whole anywhere on your website.  You might have already seen some people publish their email address as: mail at domain.com instead of mail@domain.com or similar.  This prevents spammers from automatically scanning your site and picking up your email address to add to spam lists.

## Disable any catch-all email addresses you might have.  Sometimes the email address being Joe-Jobbed does not actually exist.  In this case you might be getting all the "Delivery Failed" bouncebacks because you have a catch-all email address picking them up.  If you disable the catch-all you would stop receiving emails for email addresses at your domain that you did not manually set up.